Cocho I just want to be sure I understand your PH situation. Your Tap water is high around 8.5 and goes as low as 5.5 in a week or so after feeding/watering.
So you are saying when you feed and water your plant it normally swings up from below 6.0 to above 8.0 when you water and feed. To me that is a very wide swing. you asked about how to adjust pH up. Baking Soda and Lime can do this but I'm thinking you need to pH down before you feed and water.
RO/water mixed with your regular tap water I believe should bring your feeding and flushing PH down.
I hope Mr.furley and some other wizards and alchemists can chime in
Read the whole article but this section covers what I mean.,
NebulaHaze 's tutorial on pH http://www.growweedeasy.com/ph
No Need to Be Exact - Let pH Range Up & Down
The thing to remember with pH is that you don't need to be exact. What you do need to be is consistent in keeping the pH from creeping too high or too low in your plant root zone.
As long as you stick within the recommended pH ranges above, you will prevent the majority of all nutrient problems caused by too-high or too-low pH.
Why is it a good idea to let the pH cover a range instead of always adjusting to the exact same pH number? Some nutrients are better absorbed at slightly higher pH readings, while others are absorbed better at lower pH readings. Not having to try to pinpoint an exact number also saves a lot of unnecessary frustration.
If your marijuana plant roots are experiencing the wrong pH, it's recommended you react as soon as you notice, and not wait until you actually notice problems with the leaves. It can be tempting to ignore a pH problem, but you’ll often get the best results by acting before your plant displays a problem. That being said, if your plant is growing green, vibrant and healthy, sometimes the old saying applies, "if it ain't broke, don't fix it."
Tips
So you are saying when you feed and water your plant it normally swings up from below 6.0 to above 8.0 when you water and feed. To me that is a very wide swing. you asked about how to adjust pH up. Baking Soda and Lime can do this but I'm thinking you need to pH down before you feed and water.
RO/water mixed with your regular tap water I believe should bring your feeding and flushing PH down.
I hope Mr.furley and some other wizards and alchemists can chime in
Read the whole article but this section covers what I mean.,
NebulaHaze 's tutorial on pH http://www.growweedeasy.com/ph
No Need to Be Exact - Let pH Range Up & Down
The thing to remember with pH is that you don't need to be exact. What you do need to be is consistent in keeping the pH from creeping too high or too low in your plant root zone.
As long as you stick within the recommended pH ranges above, you will prevent the majority of all nutrient problems caused by too-high or too-low pH.
Why is it a good idea to let the pH cover a range instead of always adjusting to the exact same pH number? Some nutrients are better absorbed at slightly higher pH readings, while others are absorbed better at lower pH readings. Not having to try to pinpoint an exact number also saves a lot of unnecessary frustration.
If your marijuana plant roots are experiencing the wrong pH, it's recommended you react as soon as you notice, and not wait until you actually notice problems with the leaves. It can be tempting to ignore a pH problem, but you’ll often get the best results by acting before your plant displays a problem. That being said, if your plant is growing green, vibrant and healthy, sometimes the old saying applies, "if it ain't broke, don't fix it."
Tips
- Be consistent in making sure pH stays in the range
- You don’t need to be exact, just keep an eye on things and react if you notice the pH is getting too high or too low
- Add all of your nutrients to your water first before checking and adjusting the pH. Your nutrients will affect the pH of your water so it's important they get added before making any adjustments.
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